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72 Electrical installation
Connecting the power cables
Diagram
1)
(PE)
PE
For alternatives, see
Disconnecting device
(disconnecting
means)
(page 53).
1), 2)
If shielded cable is used (not required but
recommended), use a separate PE cable (1) or a
cable with a grounding conductor (2) if the
conductivity of the input cable shield is < 50% of
the conductivity of the phase conductor.
Ground the other end of the input cable shield or PE
conductor at the distribution board.
3) 360-degree grounding recommended if shielded
cable is used
4) 360-degree grounding required
5) Use a separate grounding cable if the
conductivity of the cable shield is < 50% of the
conductivity of the phase conductor and there is
no symmetrically constructed grounding
conductor in the cable. See
cables
) (page 60).
Note:
If there is a symmetrically constructed grounding
conductor in the motor cable in addition to the
conductive shield, connect the grounding
conductor to the grounding terminal at the drive
and motor ends.
Do not use an asymmetrically constructed motor
cable for motors > 30 kW (40 hp). Connecting its
fourth conductor at the motor end increases
bearing currents and causes extra wear.
INPUT
PE
U1
V1 W1
2)
3)
(PE)
L1
L2
L3
Grounding of the motor cable shield at the
For minimum radio frequency interference:
Selecting the power
Drive
OUTPUT
-
UDC+ UDC
U2
U1
3
Motor
motor end
• ground the cable shield 360 degrees at the
lead-through of the motor terminal box
Conductive gaskets
• or ground the cable by twisting the shield as
follows: flattened width > 1/5 · length.
b
a
V2 W2
4)
5)
V1
W1
~
360-degree
grounding
b > 1/5 · a
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